/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Stream the level (by Name); Calling again before it finishes has no effect
static void LoadStreamLevel ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * WorldContextObject, [FName](API\Runtime\Core\UObject\FName) LevelName, bool bMakeVisibleAfterLoad, bool bShouldBlockOnLoad, [FLatentActionInfo](API\Runtime\Engine\Engine\FLatentActionInfo) LatentInfo )